We are already there. Europeans all use Coinbase and other US exchanges. Coinbase alone brought over $80B in market cap to the US. 100 times more than the market cap of Yahoo when it IPOed.
Also, Germany and three other European countries are left out explicitly by their EULA. You can create an account and use it for trading, but this would be against their EULA.
source? I dont use coinbase because of higher costs and all the US shenanigans with other people's data